Ultramarine is a
cool dark color with the hex code #0000A3.
This vibrant hue can be represented as RGB
0, 0, 163 in digital design or CMYK 100%, 100%, 0%, 36% for print applications.
Find matching Pantone color.
Ultramarine
#0000A3
Ultramarine color values
- HEX
- #0000A3
- RGB
- 0, 0, 163
- HSL
- 240°, 100%, 32%
- CMYK
- 100, 100, 0, 36
Shades & tints
Darker Lighter
About this color
Ultramarine sits at 240° on the color wheel with 100% saturation and 32% lightness, placing it in the blue segment of the spectrum. With saturation at 100%, this is a high-chroma color: the kind that anchors palettes and demands considered placement. The lower lightness gives it weight and depth, lending gravity to any palette it enters.
In digital environments, Ultramarine is rendered as rgb(0, 0, 163), where the blue channel is highest at 163, producing a strongly blue character. High saturation combined with low lightness creates deep, jewel-toned results — useful for premium UI elements, hover states, and focused interaction areas.
For print, Ultramarine translates to a CMYK breakdown of 100C 100M 0Y 36K. With a moderate key (36%), this color uses black to deepen the chromatic channels rather than replace them, a profile that typically holds up well in both offset and digital print. No brands in the brandkit.pro library currently specify this exact hex as a named brand color.
Color harmonies
Complementary
Analogous
Triadic
Split-Complementary
How to use Ultramarine
CSS Variable
:root {
--brand-primary: #0000A3;
--brand-primary-rgb: 0, 0, 163;
}Define as a CSS custom property for consistent theming across your site.
Tailwind Config
colors: {
brand: '#0000A3',
}
Add to your Tailwind config to use classes like bg-brand.
Print Design (CMYK)
C: 100%
M: 100%
Y: 0%
K: 36%Use these CMYK values in Adobe Illustrator, InDesign, or print specifications.
RGB for Screens
rgb(0, 0, 163)
rgba(0, 0, 163, 0.8)Use RGB notation for compatibility or add alpha channel for transparency.
Brands using similar hue
24 brand s with colors near 240° on the color wheel
Frequently asked questions
What color is #0000A3?
#0000A3 is Ultramarine, a cool dark color with RGB values of 0, 0, 163. It has a hue of 240°, 100%
saturation, and 32% lightness in the HSL color
space.
What is the RGB value of #0000A3?
The RGB color code for #0000A3 is rgb(0, 0, 163). This means it contains 0 red,
0 green, and 163 blue in the RGB color model.
Is Ultramarine a warm or cool color?
Ultramarine (#0000A3) is a cool color with a hue between 120-300° on the color wheel.
How do I use #0000A3 in CSS?
You can use #0000A3 in CSS with:
background-color: #0000A3; or color: #0000A3; or as an RGB value: rgb(0, 0, 163). For print design, use CMYK: 100%, 100%, 0%, 36%.